This is the Heavy Duty HI-START Launching Device by Dynaflite. Requiring an 800 ft clear launch area, this hi-start can launch sailplanes with 100 (2.5m) wingspans and greater over 500ft in altitude. COMMENTS: If there is not at least 800ft of space for launching, suggest GPMP8020 UP-START which only requires 300ft of space. mgc 8-27-98 ir/jl updt jxs 6/10/09